Ice loss on Greenland used to be driven by massive calving glaciers. Now surface melt dominates, driven by sun, dust and the surprising role of microbes.
Greenland has hundreds of archeological sites that have never been excavated, but a shortage of homegrown archeologists to explore their homeland. A few young upstarts want to change that.
Archaeologists have a new answer to the mystery of Greenland's Norse, who thrived for centuries and then vanished.
In the effort to end its HIV/AIDS epidemic, South Africa has made strides, but still faces major challenges.
Ambitious experiment will test whether rising CO2 will boost the tropical carbon sink.
A controversial strategy known as mass drug administration could be key to wiping out the disease in the Mekong region.
A Myanmar exile who fled the country during the 1988 uprising is back to help her country eliminate malaria.
As malaria experts chart their battle plans, they are looking to the past for clues.
A new effort to reach migrant workers could make or break plans for malaria elimination.
A remote province of Cambodia is the epicenter of possibly the greatest threat to malaria control as the deadliest malaria parasite becomes resistant to drugs.
With the push to offer antiretroviral drugs to all HIV-infected people and no new funding on the horizon, resource-limited countries are going to have to become more creative in delivering care.
Massive, slow-motion landslides threaten the only land route into Alaska's North Slope oil fields. One 20-meter-high slide has bulldozed its way to within 40 meters of the road.